I think athletic competition at the world level is going to change. We're going to have competitions essentially with people who have re-engineered their muscles, and all the records in speed and strength events are just going to go by the boards. It's a terrible thing, because it will make a mockery of all the competition of the past.

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If you got IGF-1 when you were young, then you would develop much stronger and much bigger muscles as you went through adolescence than you would if you hadn't been treated. So it would change the whole sort of composition of your muscles. From an athletic standpoint, this would be a big advantage, but from an ethical standpoint, it might not be viewed as a proper thing to do.

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